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I've actually had a breeding pair of Bolivians in a 20g tank at one stage, and they went well. But when you think of having more than 2 in the same tank, then you really need to start thinking about going to at least a 30g tank. And you should learn to sex them too. I agree with Taurus and Scotti - it's not the best size tank for any more than 2.

Three-fourths of the Earth's surface is water, and one-fourth is land. It is quite clear that the good Lord intended us to spend triple the amount of time fishing as taking care of the lawn. ~Chuck Clark

I'm starting to think I have two males. One of them is probably about 2/3 the size of the other (juvie?). They are slightly aggressive towards each other - usually the big one is the bully but I've seen the small one chasing the big one a few times. Not a whole lot of lip-locking, though. For the first few weeks after they got acclimated they were inseparable but I guess they drifted apart. They seem to stay apart from each other.

The only features I've seen that would help in sexing are the extended rays on the big one's tail fin, which lead me to believe it is a male.

The only features I've seen that would help in sexing are the extended rays on the big one's tail fin, which lead me to believe it is a male.

1. If the anal fin is more pointed/more defined angles, squarish in shape, then it's a male. If it's longer and rounder then it's female.

2. The little breeding tube, just in front of the anal fin. Kind of looks like a little bump. Well, the male has a smaller, more pointed one, while the female has a larger more rounded one to pass eggs through. (These can be to hard to tell apart if they're still very young)

3. The dorsal fin can be a give away too. The female can have a gradual slope, sloping backwards at the front of the fin. And most males can have a longer third ray (the spikes in the fin). This isn't always accurate though.

4. Males tend to be larger and more colourful. The pinks and blues brighter, and the eye spot on each side much more vibrant.

Three-fourths of the Earth's surface is water, and one-fourth is land. It is quite clear that the good Lord intended us to spend triple the amount of time fishing as taking care of the lawn. ~Chuck Clark

A 75 gal with eight Discus, fake plants, and a lot of wood also with sand substrate. Clean up crew is down to just two Sterba's Corys. Filters: continuous new water flow; canister w/UV, in-tank algae scrubber!! Finally, junked the nitrate removal unit from hell.

A 75 gal with eight Discus, fake plants, and a lot of wood also with sand substrate. Clean up crew is down to just two Sterba's Corys. Filters: continuous new water flow; canister w/UV, in-tank algae scrubber!! Finally, junked the nitrate removal unit from hell.

Its a good move to ask besides using the advisor - can't beat experience.

Knowledge is fun(damental)

A 75 gal with eight Discus, fake plants, and a lot of wood also with sand substrate. Clean up crew is down to just two Sterba's Corys. Filters: continuous new water flow; canister w/UV, in-tank algae scrubber!! Finally, junked the nitrate removal unit from hell.